Ninject.MVC5 not generating NinjectWebCommon.Cs

Question

I'm developing a MVC5 project on Visual Studio 2017 Version 15.4. I'm getting unexpected result here what I never faced before. I've installed Ninject.MVC5 package from nuget. It's installing nicely and not giving any error or warning. But problem is it's not generating NinjectWebCommon.cs file in App_Start folder. Is there any reason?

Answer 1

It looks like the most recent Ninject.Web.Common.WebHost 3.3.0 NuGet package no longer includes the NinjectWebCommon.cs. Older versions, such as 3.2.0 do include this file.

Ninject.Web.Common.WebHost 3.3.0 provides a NinjectHttpApplication class you can derive from and use instead of the NinjectWebCommon.cs. The wiki documentation for Ninject does not seem to have been updated but it looks like using the NinjectHttpApplication is one documented approach

see mat's comment - Web API2 NinjectWebCommon.cs do not appear

Answer 2

After lot of search and tests, I've got the exact solution, where I faced error while system was trying to create multiple instances at a time with the previous answer. Here I needed to create NinjectWebCommon class only without inheriting NinjectHttpApplication.

public static class NinjectWebCommon
{
    private static readonly Bootstrapper bootstrapper = new Bootstrapper();

    /// <summary>
    /// Starts the application
    /// </summary>
    public static void Start()
    {
        DynamicModuleUtility.RegisterModule(typeof(OnePerRequestHttpModule));
        DynamicModuleUtility.RegisterModule(typeof(NinjectHttpModule));
        bootstrapper.Initialize(CreateKernel);
    }

    /// <summary>
    /// Stops the application.
    /// </summary>
    public static void Stop()
    {
        bootstrapper.ShutDown();
    }

    /// <summary>
    /// Creates the kernel that will manage your application.
    /// </summary>
    /// <returns>The created kernel.</returns>
    /// <summary>
    /// Creates the kernel that will manage your application.
    /// </summary>
    /// <returns>The created kernel.</returns>
    private static IKernel CreateKernel()
    {
        var kernel = new StandardKernel();
        RegisterServices(kernel);
        return kernel;
    }

    /// <summary>
    /// Load your modules or register your services here!
    /// </summary>
    /// <param name="kernel">The kernel.</param>
    private static void RegisterServices(IKernel kernel)
    {
        kernel.Load(new INinjectModule[]
        {
            new Module()
        });
    }
}

But here is a problem with parameterized constructor. To avoid this issue I added a method to create Concrete Instance. So here is the updated code..

public static class NinjectWebCommon
{
    private static readonly Bootstrapper bootstrapper = new Bootstrapper();

    /// <summary>
    /// Starts the application
    /// </summary>
    public static void Start()
    {
        DynamicModuleUtility.RegisterModule(typeof(OnePerRequestHttpModule));
        DynamicModuleUtility.RegisterModule(typeof(NinjectHttpModule));
        bootstrapper.Initialize(CreateKernel);
    }

    /// <summary>
    /// Stops the application.
    /// </summary>
    public static void Stop()
    {
        bootstrapper.ShutDown();
    }

    /// <summary>
    /// Creates the kernel that will manage your application.
    /// </summary>
    /// <returns>The created kernel.</returns>
    /// <summary>
    /// Creates the kernel that will manage your application.
    /// </summary>
    /// <returns>The created kernel.</returns>
    private static IKernel CreateKernel()
    {
        return Container;
    }

    public static T GetConcreteInstance<T>()
    {
        object instance = Container.TryGet<T>();
        if (instance != null)
            return (T)instance;
        throw new InvalidOperationException(string.Format("Unable to create an instance of {0}", typeof(T).FullName));
    }

    public static IKernel _container;
    private static IKernel Container
    {
        get
        {
            if (_container == null)
            {
                _container = new StandardKernel();
                _container.Bind<Func<IKernel>>().ToMethod(ctx => () => new Bootstrapper().Kernel);
                _container.Bind<IHttpModule>().To<HttpApplicationInitializationHttpModule>();

                RegisterServices(_container);
            }
            return _container;
        }
    }

    /// <summary>
    /// Load your modules or register your services here!
    /// </summary>
    /// <param name="kernel">The kernel.</param>
    private static void RegisterServices(IKernel kernel)
    {
        kernel.Load(new INinjectModule[]
        {
            new Module()
        });
    }
}